/*
 * Copyright (C) Tristan Franssen, <tristanfranssen@strawhats.nl>.
 *
 * This software is licensed under the Apache License, Version 2.0 (the "License");
 * You may not use this file except in compliance with the License.
 * You may obtain a copy of the License in the file LICENSE or at
 * http://www.apache.org/licenses/LICENSE-2.0
 */
#include "tool-file.h"

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#define COSMS_CORE_FILE_TOOL_LARGE_FILE_SIZE 5242880000ULL
#define CHUNK 4096

#define LARGE_FILE_PATH "tests/data/large-file.bin"

#define SMALL_DELETE_FILE_PATH "tests/data/small-delete-file.bin"
#define LARGE_DELETE_FILE_PATH "tests/data/large-delete-file.bin"

/**
 * @brief Generates a large nearly 5GB file for testing.
 */
int cosms_core_tool_file_generate_large_file(void) {
    FILE *file = fopen(LARGE_FILE_PATH, "wb");
    if (file == NULL) {
        return -1;
    }

    static char buffer[CHUNK];
    for (unsigned int index = 0; index < CHUNK; index += 1) {
        buffer[index] = 'a';
    }

    unsigned long long written_bytes = 0;
    while (written_bytes < COSMS_CORE_FILE_TOOL_LARGE_FILE_SIZE) {
        unsigned int bytes_to_write = CHUNK;
        if (written_bytes + CHUNK > COSMS_CORE_FILE_TOOL_LARGE_FILE_SIZE) {
            bytes_to_write = (unsigned int)(COSMS_CORE_FILE_TOOL_LARGE_FILE_SIZE - written_bytes);
        }

        fwrite(buffer, 1, bytes_to_write, file);
        written_bytes += bytes_to_write;
    }

    fclose(file);
    return 0;
}

/**
 * @brief Generates files to be deleted.
 */
int cosms_core_tool_file_generate_delete_file(void) {
    FILE *file = fopen(SMALL_DELETE_FILE_PATH, "wb");
    if (file == NULL) {
        return -1;
    }

    char *small_buffer = "Hello, World!";
    fwrite(small_buffer, 1, strlen(small_buffer), file);

    fclose(file);

    file = fopen(LARGE_DELETE_FILE_PATH, "wb");
    if (file == NULL) {
        return -1;
    }

    static char large_buffer[CHUNK];
    for (unsigned int index = 0; index < CHUNK; index += 1) {
        large_buffer[index] = 'a';
    }

    unsigned long long written_bytes = 0;
    while (written_bytes < COSMS_CORE_FILE_TOOL_LARGE_FILE_SIZE) {
        unsigned int bytes_to_write = CHUNK;
        if (written_bytes + CHUNK > COSMS_CORE_FILE_TOOL_LARGE_FILE_SIZE) {
            bytes_to_write = (unsigned int)(COSMS_CORE_FILE_TOOL_LARGE_FILE_SIZE - written_bytes);
        }

        fwrite(large_buffer, 1, bytes_to_write, file);
        written_bytes += bytes_to_write;
    }

    fclose(file);
    return 0;
}